What that says is that 10 cups of sugar should weigh 4 pounds (#) 11 ounces and 20 cups of flour should weigh 5 pounds 13 ounces.
You have the option of measuring by volume in cups or by weight in pounds and ounces. They listed it both ways.

The conversation that I did was by volume. If you want if by weight, let us know and i'll convert the weight measurements.